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How to Replace the Key Battery on a Smart 451

Model: Smart Smart 451 - Years: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
Part: Key

See other generations:
Video tutorial

If the key for your Smart 451 has suddenly stopped working, it is likely that the small button battery inside has completely drained. In this guide, you will learn how to correctly and safely replace the battery.

First, open the key cover with your hands, then remove the battery holder and replace it with a new compatible battery. Once fitted, reassemble the key cover, and the procedure is successfully completed.


Updated on 30 August 2026 by ScegliAuto


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